Not turning on clicking

Hi I need some advice I have a iMac g3. When I press the on button it makes a clicking sound from the right speaker. Wondering if anyone can advise best way to fix this if possible

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@spiderjocky time to start tearing it open and look at the electrolytic capacitors. I would imaging that it is time for a good recap. Post some pictures of what it all looks like with your QUESTION. That way we can see what you see. Adding images to an existing question

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